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{{Tfm/dated|page=Check for unknown parameters/doc|otherpage=Check for deprecated parameters|link=Wikipedia:Templates for discussion/Log/2019 December 30#Module:Check for unknown parameters|type=module|help=off|bigbox=yes}}{{High-risk|8200000+}}
{{module rating|p}}
<!-- Categories go at the bottom of this page and interwikis go in Wikidata. -->
This module may be appended to a template to check for uses of unknown parameters.
== Usage ==
=== Basic usage ===
<pre>
{{#invoke:check for unknown parameters|check
|unknown=[[Category:Some tracking category]]
|arg1|arg2|arg3|argN}}
</pre>
or to sort the entries in the tracking category by parameter with a preview error message
<pre>
{{#invoke:check for unknown parameters|check
|unknown=[[Category:Some tracking category|_VALUE_]]
|preview=unknown parameter "_VALUE_"
|arg1|arg2|...|argN}}
</pre>
or for an explicit red error message
<pre>
{{#invoke:check for unknown parameters|check
|unknown=<span class="error">Sorry, I don't recognize _VALUE_</span>
|arg1|arg2|...|argN}}
</pre>
Here, <code>arg1</code>, <code>arg2</code>, ..., <code>argN</code>, are the known parameters. Unnamed (positional) parameters can be added too: <code><nowiki>|1|2|argname1|argname2|...</nowiki></code>. Any parameter which is used, but not on this list, will cause the module to return whatever is passed with the <code>unknown</code> parameter. The <code>_VALUE_</code> keyword, if used, will be changed to the name of the parameter. This is useful for either sorting the entries in a tracking category, or for provide more explicit information.
By default, the module makes no distinction between a defined-but-blank parameter and a non-blank parameter. That is, both unlisted {{para|foo|x}} and {{para|foo}} are reported. To only track non-blank parameters use {{para|ignoreblank|1}}.
By default, the module ignores blank positional parameters. That is, an unlisted {{para|2}} is ignored. To ''include'' blank positional parameters in the tracking use {{para|showblankpositional|1}}.
=== Lua patterns ===
This module supports [[:mw:Extension:Scribunto/Lua reference manual#Patterns|Lua patterns]] (similar to [[regular expression]]s), which are useful when there are many known parameters which use a systematic pattern. For example, [[template:infobox3cols]] uses
<pre>
| regexp1 = header[%d][%d]*
| regexp2 = label[%d][%d]*
| regexp3 = data[%d][%d]*[abc]?
| regexp4 = class[%d][%d]*[abc]?
| regexp5 = rowclass[%d][%d]*
| regexp6 = rowstyle[%d][%d]*
| regexp7 = rowcellstyle[%d][%d]*
</pre>
to match all parameters of the form <code>headerNUM</code>, <code>labelNUM</code>, <code>dataNUM</code>, <code>dataNUMa</code>, <code>dataNUMb</code>, <code>dataNUMc</code>, ..., <code>rowcellstyleNUM</code>, where NUM is a string of digits.
== Example ==
<pre>
{{Infobox
| above = {{{name|}}}
| label1 = Height
| data1 = {{{height|}}}
| label2 = Weight
| data2 = {{{weight|}}}
| label3 = Website
| data3 = {{{website|}}}
}}<!--
end infobox, start tracking
-->{{#invoke:Check for unknown parameters|check
| unknown = {{main other|[[Category:Some tracking category|_VALUE_]]}}
| preview = unknown parameter "_VALUE_"
| name
| height | weight
| website
}}
</pre>
==See also==
* {{clc|Unknown parameters}} (category page can have header {{tl|Unknown parameters category}})
* [[Module:Check for deprecated parameters]] – similar module that checks for deprecated parameters
* [[Module:TemplatePar]] – similar function (originally from dewiki)
* [[Template:Parameters]] and [[Module:Parameters]] – generates a list of parameter names for a given template
* [[Project:TemplateData]] based template parameter validation
** [[:he:Module:ParamValidator]] – parameter validation system on hewiki, relies on TemplateData. module doc in English. checks the following:
***use of undeclared parameters
*** use of parameters marked in templatedata "deprecated"
*** mistyped (mainly, parameters declared in templatedata as "number" receiving non-numerical value)
***missing parameters marked in TemplateData as "required"
***understands aliases, and warns when more than one alias of a parameter is used
** [[:cs:Module:CheckParameters]] – another parameter check system on cswiki that relies on TemplateData
* [[s:cs:Module:MonitorTemplateArguments]] – a template parameter monitoring system based on tracking categories
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